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Wellhead stuffing box support assembly

  • US 20030127220A1
  • Filed: 01/04/2002
  • Published: 07/10/2003
  • Est. Priority Date: 01/04/2002
  • Status: Active Grant
First Claim
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1. A support assembly, for connection between the upper end of a production pumping tree and the lower end of a stuffing box and through which a polished rod will extend, comprising:

  • a tubular lower housing having a side wall and upper and lower ends, the side wall forming a central bore therethrough, the bore having a lower portion and an expanded diameter upper portion, the side wall forming an annular flat internal shoulder at the junction of the upper and lower bore portions;

    a lower ring, having a flat bottom surface and a spherically curved top surface, seated on the shoulder, the lower ring having a central opening of sufficient diameter to accommodate the polished rod with a lateral clearance, the lower ring having a lateral clearance with the side wall of the lower housing;

    an upper housing comprising a tubular main body having upper and lower ends, the body lower end having an outwardly protruding flange, the flange being positioned in the upper portion of the lower housing bore and being seated on the lower ring, the flange having spherically curved upper and lower surfaces having a common center, the flange lower surface conforming to the top surface of the lower ring, the main body having a central bore extending therethrough for accommodating the polished rod, the flange having a lateral clearance with the lower housing side wall;

    an upper ring seated on the flange, the upper ring having a spherically curved bottom surface for conforming with and contacting the flange upper surface to retain the flange against upward movement, the upper ring having a lateral clearance with the side wall of the lower housing;

    an annular cap attached to the upper end of the lower housing, the cap having a transverse wall having a bottom surface retaining the rings and flange within the expanded diameter upper portion of the lower housing bore, the cap wall forming a central opening through which the main body of the upper housing extends with a lateral clearance; and

    means for centralizing the polished rod within the main body;

    whereby the upper housing may tilt coaxially with the polished rod and move laterally to a limited extent.

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